An investigation by an Australian TV news program suggests the pilot of Malaysia Airlines Flight 370, which disappeared with 239 people aboard more than four years ago, deliberately crashed into the Indian Ocean.

Investigators are still searching for the aircraft, but these findings raise the possibility that one of the greatest aviation mysteries in modern history may not have been a catastrophic accident, but instead a possible mass murder-suicide.

"60 Minutes Australia" brought together an international group of aviation experts who say that the disappearance of MH370 was a criminal act by veteran pilot Captain Zaharie Ahmad Shah.

"He was killing himself; unfortunately, he was killing everybody else on board, and he did it deliberately," said Canadian Air crash investigator Larry Vance.

Boeing 777 pilot and instructor Simon Hardy reconstructed the flight plan based on military radar, and says Captain Shah flew along the border of Malaysia and Thailand, crossing in and out of each country's airspace to avoid detection.

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